A s100 N m torque is applied to a 1-m-long, solid round steel shaft. Design it to limit its angular deflection 2°, if shear modulus of elasticity 80 GPa and to determine the fatigue strength of the material.

assuming factor of safety of 2  

Se = 118.858 MPa

Explanation:

Torque = ± 100 N m

length of solid round steel shaft = 1-m

Angular deflection = 2°

shear modulus of elasticity = 80 GPa

Calculate Fatigue strength of material

apply Von-miss effective stress rule to determine the Von mises stress  

max torque = 100 + 0

assuming a  factor of safety of 2  

Se(fatigue strength of material ) = Von mises stress * Fs

                                                     = 59.429 * 2 = 118.858 MPa